﻿using System;
using System.Collections.Generic;
using System.Text;

namespace Draco.DB.ORM.Utility
{
    /// <summary>
    /// 字符辅助方法
    /// </summary>
    public class CharacterHelper
    {
        private static int[] pyvalue = new int[]{-20319,-20317,-20304,-20295,-20292,-20283,-20265,-20257,-20242,-20230,-20051,-20036,-20032,-20026, 
												  -20002,-19990,-19986,-19982,-19976,-19805,-19784,-19775,-19774,-19763,-19756,-19751,-19746,-19741,-19739,-19728, 
												  -19725,-19715,-19540,-19531,-19525,-19515,-19500,-19484,-19479,-19467,-19289,-19288,-19281,-19275,-19270,-19263, 
												  -19261,-19249,-19243,-19242,-19238,-19235,-19227,-19224,-19218,-19212,-19038,-19023,-19018,-19006,-19003,-18996, 
												  -18977,-18961,-18952,-18783,-18774,-18773,-18763,-18756,-18741,-18735,-18731,-18722,-18710,-18697,-18696,-18526, 
												  -18518,-18501,-18490,-18478,-18463,-18448,-18447,-18446,-18239,-18237,-18231,-18220,-18211,-18201,-18184,-18183, 
												  -18181,-18012,-17997,-17988,-17970,-17964,-17961,-17950,-17947,-17931,-17928,-17922,-17759,-17752,-17733,-17730, 
												  -17721,-17703,-17701,-17697,-17692,-17683,-17676,-17496,-17487,-17482,-17468,-17454,-17433,-17427,-17417,-17202, 
												  -17185,-16983,-16970,-16942,-16915,-16733,-16708,-16706,-16689,-16664,-16657,-16647,-16474,-16470,-16465,-16459, 
												  -16452,-16448,-16433,-16429,-16427,-16423,-16419,-16412,-16407,-16403,-16401,-16393,-16220,-16216,-16212,-16205, 
												  -16202,-16187,-16180,-16171,-16169,-16158,-16155,-15959,-15958,-15944,-15933,-15920,-15915,-15903,-15889,-15878, 
												  -15707,-15701,-15681,-15667,-15661,-15659,-15652,-15640,-15631,-15625,-15454,-15448,-15436,-15435,-15419,-15416, 
												  -15408,-15394,-15385,-15377,-15375,-15369,-15363,-15362,-15183,-15180,-15165,-15158,-15153,-15150,-15149,-15144, 
												  -15143,-15141,-15140,-15139,-15128,-15121,-15119,-15117,-15110,-15109,-14941,-14937,-14933,-14930,-14929,-14928, 
												  -14926,-14922,-14921,-14914,-14908,-14902,-14894,-14889,-14882,-14873,-14871,-14857,-14678,-14674,-14670,-14668, 
												  -14663,-14654,-14645,-14630,-14594,-14429,-14407,-14399,-14384,-14379,-14368,-14355,-14353,-14345,-14170,-14159, 
												  -14151,-14149,-14145,-14140,-14137,-14135,-14125,-14123,-14122,-14112,-14109,-14099,-14097,-14094,-14092,-14090, 
												  -14087,-14083,-13917,-13914,-13910,-13907,-13906,-13905,-13896,-13894,-13878,-13870,-13859,-13847,-13831,-13658, 
												  -13611,-13601,-13406,-13404,-13400,-13398,-13395,-13391,-13387,-13383,-13367,-13359,-13356,-13343,-13340,-13329, 
												  -13326,-13318,-13147,-13138,-13120,-13107,-13096,-13095,-13091,-13076,-13068,-13063,-13060,-12888,-12875,-12871, 
												  -12860,-12858,-12852,-12849,-12838,-12831,-12829,-12812,-12802,-12607,-12597,-12594,-12585,-12556,-12359,-12346, 
												  -12320,-12300,-12120,-12099,-12089,-12074,-12067,-12058,-12039,-11867,-11861,-11847,-11831,-11798,-11781,-11604, 
												  -11589,-11536,-11358,-11340,-11339,-11324,-11303,-11097,-11077,-11067,-11055,-11052,-11045,-11041,-11038,-11024, 
												  -11020,-11019,-11018,-11014,-10838,-10832,-10815,-10800,-10790,-10780,-10764,-10587,-10544,-10533,-10519,-10331, 
												  -10329,-10328,-10322,-10315,-10309,-10307,-10296,-10281,-10274,-10270,-10262,-10260,-10256,-10254};
        private static string[] pystr = new string[]{"A","Ai","An","Ang","Ao","Ba","Bai","Ban","Bang","Bao","Bei","Ben","Beng","Bi","Bian","Biao", 
													  "Bie","Bin","Bing","Bo","Bu","Ca","Cai","Can","Cang","Cao","Ce","Ceng","Cha","Chai","Chan","Chang","Chao","Che","Chen", 
													  "Cheng","Chi","Chong","Chou","Chu","Chuai","Chuan","Chuang","Chui","Chun","Chuo","Ci","Cong","Cou","Cu","Cuan","Cui", 
													  "Cun","Cuo","Da","Dai","Dan","Dang","Dao","De","Deng","Di","Dian","Diao","Die","Ding","Diu","Dong","Dou","Du","Duan", 
													  "Dui","Dun","Duo","E","En","Er","Fa","Fan","Fang","Fei","Fen","Feng","Fo","Fou","Fu","Ga","Gai","Gan","Gang","Gao", 
													  "Ge","Gei","Gen","Geng","Gong","Gou","Gu","Gua","Guai","Guan","Guang","Gui","Gun","Guo","Ha","Hai","Han","Hang", 
													  "Hao","He","Hei","Hen","Heng","Hong","Hou","Hu","Hua","Huai","Huan","Huang","Hui","Hun","Huo","Ji","Jia","Jian", 
													  "Jiang","Jiao","Jie","Jin","Jing","Jiong","Jiu","Ju","Juan","Jue","Jun","Ka","Kai","Kan","Kang","Kao","Ke","Ken", 
													  "Keng","Kong","Kou","Ku","Kua","Kuai","Kuan","Kuang","Kui","Kun","Kuo","La","Lai","Lan","Lang","Lao","Le","Lei", 
													  "Leng","Li","Lia","Lian","Liang","Liao","Lie","Lin","Ling","Liu","Long","Lou","Lu","Lv","Luan","Lue","Lun","Luo", 
													  "Ma","Mai","Man","Mang","Mao","Me","Mei","Men","Meng","Mi","Mian","Miao","Mie","Min","Ming","Miu","Mo","Mou","Mu", 
													  "Na","Nai","Nan","Nang","Nao","Ne","Nei","Nen","Neng","Ni","Nian","Niang","Niao","Nie","Nin","Ning","Niu","Nong", 
													  "Nu","Nv","Nuan","Nue","Nuo","O","Ou","Pa","Pai","Pan","Pang","Pao","Pei","Pen","Peng","Pi","Pian","Piao","Pie", 
													  "Pin","Ping","Po","Pu","Qi","Qia","Qian","Qiang","Qiao","Qie","Qin","Qing","Qiong","Qiu","Qu","Quan","Que","Qun", 
													  "Ran","Rang","Rao","Re","Ren","Reng","Ri","Rong","Rou","Ru","Ruan","Rui","Run","Ruo","Sa","Sai","San","Sang", 
													  "Sao","Se","Sen","Seng","Sha","Shai","Shan","Shang","Shao","She","Shen","Sheng","Shi","Shou","Shu","Shua", 
													  "Shuai","Shuan","Shuang","Shui","Shun","Shuo","Si","Song","Sou","Su","Suan","Sui","Sun","Suo","Ta","Tai", 
													  "Tan","Tang","Tao","Te","Teng","Ti","Tian","Tiao","Tie","Ting","Tong","Tou","Tu","Tuan","Tui","Tun","Tuo", 
													  "Wa","Wai","Wan","Wang","Wei","Wen","Weng","Wo","Wu","Xi","Xia","Xian","Xiang","Xiao","Xie","Xin","Xing", 
													  "Xiong","Xiu","Xu","Xuan","Xue","Xun","Ya","Yan","Yang","Yao","Ye","Yi","Yin","Ying","Yo","Yong","You", 
													  "Yu","Yuan","Yue","Yun","Za","Zai","Zan","Zang","Zao","Ze","Zei","Zen","Zeng","Zha","Zhai","Zhan","Zhang", 
													  "Zhao","Zhe","Zhen","Zheng","Zhi","Zhong","Zhou","Zhu","Zhua","Zhuai","Zhuan","Zhuang","Zhui","Zhun","Zhuo", 
													  "Zi","Zong","Zou","Zu","Zuan","Zui","Zun","Zuo"};
        /// <summary>
        /// 将字符串中的汉字转成拼音
        /// </summary>
        /// <param name="chrstr"></param>
        /// <returns></returns>
        public static string ConvertToLetter(string chrstr)
        {
            if (chrstr == null || chrstr.Length == 0)
                return chrstr;
            byte[] array = new byte[2];
            StringBuilder returnstr = new StringBuilder();
            int chrasc = 0;
            int i1 = 0;
            int i2 = 0;
            //char[] nowchar=chrstr.ToCharArray(); 
            for (int j = 0; j < chrstr.Length; j++)
            {
                array = System.Text.Encoding.Default.GetBytes(chrstr[j].ToString());
                if (array.Length == 1)
                {
                    returnstr.Append(chrstr[j]);
                    continue;
                }
                i1 = (short)(array[0]);
                i2 = (short)(array[1]);

                chrasc = i1 * 256 + i2 - 65536;
                if (chrasc > 0 && chrasc < 160)
                {
                    returnstr.Append(chrstr[j]);
                }
                else
                {
                    for (int i = (pyvalue.Length - 1); i >= 0; i--)
                    {
                        if (pyvalue[i] <= chrasc)
                        {
                            returnstr.Append(pystr[i]);
                            break;
                        }
                    }
                }
            }
            return returnstr.ToString();
        }

        /// <summary>
        /// 判断是否是合法的变量名称
        /// </summary>
        /// <param name="name"></param>
        /// <returns></returns>
        public static bool IsIdentifier(string name)
        {
            for (int index = 0; index < name.Length; index++)
            {
                var category = char.GetUnicodeCategory(name, index);
                // this is not nice, but I found no other way to identity a valid identifier
                switch (category)
                {
                    case System.Globalization.UnicodeCategory.DecimalDigitNumber:
                    case System.Globalization.UnicodeCategory.LetterNumber:
                    case System.Globalization.UnicodeCategory.LowercaseLetter:
                    case System.Globalization.UnicodeCategory.UppercaseLetter:
                        break;
                    default:
                        return false;
                }
            }
            return true;
        }
    }
}
